2243681 has 4 divisors (see below), whose sum is σ = 2447664. Its totient is φ = 2039700.

The previous prime is 2243669. The next prime is 2243693. The reversal of 2243681 is 1863422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2243669) and next prime (2243693).

It is a cyclic number.

It is not a de Polignac number, because 2243681 - 2⁶ = 2243617 is a prime.

It is a super-2 number, since 2×2243681² = 10068208859522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2243681.

It is not an unprimeable number, because it can be changed into a prime (2243621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101975 + ... + 101996.

It is an arithmetic number, because the mean of its divisors is an integer number (611916).

2^2243681 is an apocalyptic number.

It is an amenable number.

2243681 is a deficient number, since it is larger than the sum of its proper divisors (203983).

2243681 is a wasteful number, since it uses less digits than its factorization.

2243681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203982.

The product of its digits is 2304, while the sum is 26.

The square root of 2243681 is about 1497.8921857063. The cubic root of 2243681 is about 130.9142845834.

The spelling of 2243681 in words is "two million, two hundred forty-three thousand, six hundred eighty-one".